KR970063078A - CD / DVD combined optical pickup device - Google Patents

CD / DVD combined optical pickup device Download PDF

Info

Publication number
KR970063078A
KR970063078A KR1019960004665A KR19960004665A KR970063078A KR 970063078 A KR970063078 A KR 970063078A KR 1019960004665 A KR1019960004665 A KR 1019960004665A KR 19960004665 A KR19960004665 A KR 19960004665A KR 970063078 A KR970063078 A KR 970063078A
Authority
KR
South Korea
Prior art keywords
liquid crystal
crystal shutter
light
optical
objective lens
Prior art date
Application number
KR1019960004665A
Other languages
Korean (ko)
Other versions
KR0176898B1 (en
Inventor
김영식
Original Assignee
구자홍
Lg 전자주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 구자홍, Lg 전자주식회사 filed Critical 구자홍
Priority to KR1019960004665A priority Critical patent/KR0176898B1/en
Publication of KR970063078A publication Critical patent/KR970063078A/en
Application granted granted Critical
Publication of KR0176898B1 publication Critical patent/KR0176898B1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Abstract

본 발명은 씨디/디브이디 겸용 광픽업장치에 관한 것으로, 레이저다이오드(21)에서 발광되어 대물렌즈(25)를 거쳐 광디스크(D)에 집광되는 빔(B)의 광축에 대해 대물렌즈(25)의 개구율을 조절하기 위한 액정셔터(30)를 반사광이 광검출기(26)에 입사되지 않는 각도범위만큼 경사지게 광축상에 설치하고, 액정셔터(30)를 통과하는 빔(B)을 편광상태에 따라 투과 또는 반사시키는 유전체층(36)을 구비하여 구성되며, 상기 액정셔터(30)는 광축방향과 평행한 러빙(Rubbing)방향을 가지는 액정층(35)이 제1 및 제2글래스기판(31)(33) 사이에 구비되고, 상기 제1 및 제2글래스기판(31)(33)의 일면에는 각각 투명전극(32)(33)이 형성되며, 상기 제2글레스기판(33)의 타면에는 상기 유전체층(36)이 형성되어 구성된다. 이와 같은 본 발명에 의한 광픽업장치에 의하면 하나의 유니트에서 CD계열의 광디스크와 DVD용 고밀도 광디스크를 독취 또는 기록할 수 있게 될 뿐만 아니라 명암대비율이 좋아져 그 동작특성이 좋아지는 이점이 있다.The present invention relates to a CD / DVD combined optical pickup apparatus and a method of controlling the optical pickup apparatus of the present invention. The optical pickup apparatus includes an objective lens 25, an objective lens 25, The liquid crystal shutter 30 for adjusting the aperture ratio is provided on the optical axis in such a manner that the reflected light is inclined by an angle range that is not incident on the photodetector 26 and the beam B passing through the liquid crystal shutter 30 is transmitted The liquid crystal shutter 30 has a liquid crystal layer 35 having a rubbing direction parallel to the direction of the optical axis of the first and second glass substrates 31 and 33 Transparent electrodes 32 and 33 are formed on one surface of the first and second glass substrates 31 and 33 and a dielectric layer 33 is formed on the other surface of the second glass substrate 33 36 are formed and formed. According to the optical pick-up apparatus of the present invention, not only can a CD-type optical disc and a DVD-use high-density optical disc be readable or recorded in one unit, but also has an advantage that the contrast ratio is improved and the operation characteristics are improved.

Description

씨디/디브이디 겸용 광픽업장치CD / DVD combined optical pickup device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제5도는 본 발명에 의한 광픽업장치의 구성을 도시한 구성도.FIG. 5 is a configuration diagram showing the configuration of an optical pickup device according to the present invention; FIG.

제6도는 본 발명에 의한 광픽업장치에 사용되는 액정셔터의 구성을 도시한 단면구성도.6 is a sectional view showing the configuration of a liquid crystal shutter used in the optical pickup apparatus according to the present invention.

제7도는 본 발명에 의한 광픽업장치에 사용되는 액정셔터에 형성된 투명전극패턴을 도시한 정면도7 is a front view showing a transparent electrode pattern formed on a liquid crystal shutter used in the optical pick-up apparatus according to the present invention.

Claims (7)

레이저다이오드에서 발광됨 빔을 대물렌즈를 통하여 두께가 다른 디스크의 정보기록면에 집광하기 위하여 상기 대물렌즈의 개구수(NA)를 조절하는 액정셔터와, 상기 액정셔터를 통과한 빔의 편광 상태에 상응하는부분의 빔을 반사시키는 유전체층을 액정셔터에 일체로 형성한 것을 포함하여 구성됨을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.A liquid crystal shutter for adjusting the numerical aperture (NA) of the objective lens to condense the emitted beam in the laser diode on the information recording surface of the disk having a different thickness through the objective lens; And a dielectric layer for reflecting a beam of a portion of the liquid crystal shutter which is formed integrally with the liquid crystal shutter. 레이저다이오드에서 발광되어 대물렌즈를 거쳐 광디스크에 집광되는 광의 광축에 대해 대물렌즈의 개구율을 조절하기 위한 액정셔터를 반사광이 광검출기에 입사되지 않은 각도범위만큼 경사지게 광축상에 설치하고, 액정서텨를 통과하는 광을 편광상태에 따라 투과 또는 반사시키는 유전체층을 구비하여 구성됨을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.A liquid crystal shutter for adjusting the numerical aperture of the objective lens with respect to the optical axis of the light emitted from the laser diode and converged on the optical disk through the objective lens is disposed on the optical axis such that the reflected light is inclined by an angle range not incident on the optical detector, And a dielectric layer that transmits or reflects light that is incident on the optical disc in accordance with a polarization state. 제2항에 있어서, 상기 액정셔터는 광축방향과 평행한 러빙(Rubbing) 방향을 가지는 액정층이 제1 및 제2글레스기판사이에 구비되고, 상기 제1 및 제2글레스기판의 일면에는 각각 투명전극이 형성되며, 상기 글레스기판중 하나의 면에는 입사되는 광의 편광 광속을 분할하는 유전체층이 형성되어 구성됨을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.The liquid crystal display of claim 2, wherein the liquid crystal shutter is provided between the first and second glass substrates with a liquid crystal layer having a rubbing direction parallel to the optical axis direction, and each of the first and second glass substrates has a transparent And a dielectric layer for dividing a polarized light flux of light incident on one surface of the glass substrate is formed on the surface of the optical recording medium. 제3항에 있어서, 상기 글레스기판에 구비된 투명전극은 상기 기판의 중앙에 원형으로 형성되어 광경로차를 없애주는 원형전극과, 상기 원형전극의 둘레에 환형으로 형성되어 광속의 크기를 조절하는 환형전극임을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.[6] The apparatus of claim 3, wherein the transparent electrode provided on the glass substrate comprises a circular electrode formed in a circular shape at the center of the substrate to eliminate an optical path difference, and a ring electrode formed around the circular electrode, And the optical pickup device is an annular electrode. 제2항 또는 제3항에 있어서, 상기 유전체층은 MgF2와 ZnS를 적층하여 형성됨을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.The optical pickup device according to claim 2 or 3, wherein the dielectric layer is formed by stacking MgF 2 and ZnS. 제1항에 있어서, 상기 유전체층이 코팅된 액정셔터는 발광원과 수광원 사이의 임의의 광로 상에 설치됨을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.The optical pickup apparatus of claim 1, wherein the liquid crystal shutter coated with the dielectric layer is disposed on an arbitrary optical path between the light emitting source and the light receiving source. 레이저다이오드에서 발광된 광을 두께가 다른 디스크의 정보기록면에 집광하기 위한 광픽업장치에서 상기 디스크 두께에 따라 변화된 광선속의 폭에 해당되는 광의 편광방향을 변경하는 액정셔터와, 상기 디스크에서 반사된 광을 대물렌즈 및 액정셔터를 통하여 입사 받아 위상을 변경시키는 1/4파장판과, 상기 1/4파장판에 의해 위상이 바뀐 빔을 상기 액정셔터 및 1/4파장판의 편광방향 조절에 의해 편광광선속을 분할하는 빔스프리터를 포함하여 구성됨을 특징으로 하는 씨디/디브이디 겸용 광픽업장치.A liquid crystal shutter for changing a polarization direction of light corresponding to a width of a light beam changed in accordance with the disc thickness in an optical pickup apparatus for condensing light emitted from a laser diode on an information recording surface of a disc having a different thickness; Polarized light by a polarization direction of the liquid crystal shutter and a 1/4 wave plate, and a quarter-wave plate that receives the light through the objective lens and the liquid crystal shutter to change its phase, And a beam splitter for dividing a beam of light. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960004665A 1996-02-26 1996-02-26 Optic-pick-up device using cd/dvd KR0176898B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960004665A KR0176898B1 (en) 1996-02-26 1996-02-26 Optic-pick-up device using cd/dvd

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960004665A KR0176898B1 (en) 1996-02-26 1996-02-26 Optic-pick-up device using cd/dvd

Publications (2)

Publication Number Publication Date
KR970063078A true KR970063078A (en) 1997-09-12
KR0176898B1 KR0176898B1 (en) 1999-04-15

Family

ID=19451796

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960004665A KR0176898B1 (en) 1996-02-26 1996-02-26 Optic-pick-up device using cd/dvd

Country Status (1)

Country Link
KR (1) KR0176898B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100258467B1 (en) * 1997-03-11 2000-08-01 윤종용 Dvd optical pickup device with polarization iris

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10124902A (en) * 1996-10-17 1998-05-15 Sanyo Electric Co Ltd Optical pickup device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100258467B1 (en) * 1997-03-11 2000-08-01 윤종용 Dvd optical pickup device with polarization iris

Also Published As

Publication number Publication date
KR0176898B1 (en) 1999-04-15

Similar Documents

Publication Publication Date Title
EP0840306B1 (en) Compatible optical pickup capable of scanning multiple tracks
EP0991062A4 (en) Optical pickup device and optical disk recording and/or reproducing device
WO1999031658A1 (en) Integrated optical pickup system for use with optical disks of different thicknesses
JPH10104427A (en) Wavelength plate, and optical pickup unit equipped with the same
KR19980019132A (en) OPTICAL PICKUP DEVICE AND DISK PLAYER APPARATUS
EP1560209A1 (en) Liquid crystal optical element and optical device
US6584059B1 (en) Information recording and reproducing apparatus
JPH0487042A (en) Optical pickup device
KR970063078A (en) CD / DVD combined optical pickup device
EP0862167B1 (en) Optical recording/pickup head compatible with compact disk-recordable (CD-R) and digital versatile disk (DVD) using polarization beam splitter
KR100238074B1 (en) Optical pickup for dvd and cd-r
JP2002279683A (en) Optical pickup device
KR100255233B1 (en) Double lens dvd pickup compatible cd-r
KR19990071790A (en) Apparatus for writing to and / or reading from an optical record carrier having a different structure
JPH0434740A (en) Optical head
JPH0740374B2 (en) Light head
US6324155B1 (en) Optical information recording medium with flat reflecting film and reading system for reading information recorded thereon
KR100430364B1 (en) Compatible Optical Pickups
JP2002358683A (en) Optical pickup device
JP2001311821A (en) Phase shifter and optical head device
KR960042579A (en) Optical pick-up device
JPH1040570A (en) Light amount modulation element and optical pickup apparatus
JPH0727906A (en) Beam splitter and optical information recording and reproducing device using the same
JPH0567345A (en) Optical substrate type optical information recording/ reproducing device
JP3433036B2 (en) Optical pickup device

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20080926

Year of fee payment: 11

LAPS Lapse due to unpaid annual fee